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This test is used to determine if you have a current mononucleosis infection or if you have been infected in the past.
The mono test is primarily taken when symptoms such as fever, headache, swollen glands, and fatigue are present. The test may be repeated when it is initially negative but suspicion of mono remains high. If this test is positive, another test to indicate if the the infection is current may be required. This second test is called the Epstein Barr Virus test.
If you have ever had mono in the past, you will always test positive. If you believe you have a current mono infection and have tested positive for mono before, you should not have this test but should instead have the Epstein Barr Virus test.